zad17

#include <iostream>
using namespace std;

int main()
{
    int a, b;
    bool powtorzenie = false;
    cin >> a;
    cout << a << endl;
    cin >> b;
    if (a == b)
        return 0;
    else
    {
        cout << b << endl;
        while (powtorzenie == false)
        {
            cin >> a;
            cout << a << endl;
            if (a == b)
                powtorzenie = true;
            else
            {
                cin >> b;
                if (a == b)
                    powtorzenie = true;
                else
                    cout << b;
            }
        }
    }
    return 0;
}